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Prediction of nontrivial band topology and superconductivity in M g2Pb

Author(s): Bian, Guang; Chang, Tay Rong; Huang, Angus; Li, Yuwei; Jeng, Horng Tay; et al

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Abstract: © 2017 American Physical Society. The interplay of BCS superconductivity and nontrivial band topology is expected to give rise to opportunities for creating topological superconductors, achieved through pairing spin-filtered boundary modes via superconducting proximity effects. The thus-engineered topological superconductivity can, for example, facilitate the search for Majorana fermion quasiparticles in condensed matter systems. Here we report a first-principles study of Mg2Pb and predict that it should be a superconducting topological material. The band topology of Mg2Pb is identical to that of the archetypal quantum spin Hall insulator HgTe, while isostructural and isoelectronic Mg2Sn is topologically trivial; a trivial-to-topological transition is predicted for Mg2Sn1-xPbx for x≈0.77. We propose that Mg2Pb-Mg2Sn quantum wells should generate robust spin-filtered edge currents in analogy to HgTe/CdTe quantum wells. In addition, our calculations predict that Mg2Pb should become superconducting upon electron doping. Therefore, Mg2Pb is expected to provide a practical material platform for studying emergent phenomena arising from the interplay of superconductivity and band topology.
Publication Date: Jul-2017
Electronic Publication Date: 12-Jul-2017
Citation: Bian, G., Chang, T.R., Huang, A., Li, Y., Jeng, H.T., Singh, D.J., Cava, R.J., Xie, W. (2017). Prediction of nontrivial band topology and superconductivity in M g2Pb. Physical Review Materials, 1 (2), 10.1103/PhysRevMaterials.1.021201
DOI: doi:10.1103/PhysRevMaterials.1.021201
EISSN: 2475-9953
Pages: 1.2:021201-1 - 021201-7
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Materials
Version: Final published version. This is an open access article.
Notes: Physical Review Materials. Volume 1, Issue 2, 12 July 2017, Article number 021201.

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